diff options
Diffstat (limited to 'src/quick/items/qquicklistview.cpp')
| -rw-r--r-- | src/quick/items/qquicklistview.cpp | 168 |
1 files changed, 153 insertions, 15 deletions
diff --git a/src/quick/items/qquicklistview.cpp b/src/quick/items/qquicklistview.cpp index badd2efe29..b91e705ad0 100644 --- a/src/quick/items/qquicklistview.cpp +++ b/src/quick/items/qquicklistview.cpp @@ -141,6 +141,8 @@ public: QQuickItemViewAttached *getAttachedObject(const QObject *object) const override; + void fixupHeader(); + void fixupHeaderCompleted(); QQuickListView::Orientation orient; qreal visiblePos; qreal averageSize; @@ -169,6 +171,12 @@ public: QString nextSection; qreal overshootDist; + + qreal desiredViewportPosition; + qreal fixupHeaderPosition; + bool headerNeedsSeparateFixup : 1; + bool desiredHeaderVisible : 1; + bool correctFlick : 1; bool inFlickCorrection : 1; @@ -182,7 +190,9 @@ public: , highlightPosAnimator(nullptr), highlightWidthAnimator(nullptr), highlightHeightAnimator(nullptr) , highlightMoveVelocity(400), highlightResizeVelocity(400), highlightResizeDuration(-1) , sectionCriteria(nullptr), currentSectionItem(nullptr), nextSectionItem(nullptr) - , overshootDist(0.0), correctFlick(false), inFlickCorrection(false) + , overshootDist(0.0), desiredViewportPosition(0.0), fixupHeaderPosition(0.0) + , headerNeedsSeparateFixup(false), desiredHeaderVisible(false) + , correctFlick(false), inFlickCorrection(false) { highlightMoveDuration = -1; //override default value set in base class } @@ -1402,6 +1412,31 @@ void QQuickListViewPrivate::updateFooter() emit q->footerItemChanged(); } +void QQuickListViewPrivate::fixupHeaderCompleted() +{ + headerNeedsSeparateFixup = false; + QObjectPrivate::disconnect(&timeline, &QQuickTimeLine::updated, this, &QQuickListViewPrivate::fixupHeader); +} + +void QQuickListViewPrivate::fixupHeader() +{ + FxListItemSG *listItem = static_cast<FxListItemSG*>(header); + const bool fixingUp = (orient == QQuickListView::Vertical ? vData : hData).fixingUp; + if (fixingUp && headerPositioning == QQuickListView::PullBackHeader && visibleItems.count()) { + int fixupDura = timeline.duration(); + if (fixupDura < 0) + fixupDura = fixupDuration/2; + const int t = timeline.time(); + + const qreal progress = qreal(t)/fixupDura; + const qreal ultimateHeaderPosition = desiredHeaderVisible ? desiredViewportPosition : desiredViewportPosition - headerSize(); + const qreal headerPosition = fixupHeaderPosition * (1 - progress) + ultimateHeaderPosition * progress; + const qreal viewPos = isContentFlowReversed() ? -position() - size() : position(); + const qreal clampedPos = qBound(originPosition() - headerSize(), headerPosition, lastPosition() - size()); + listItem->setPosition(qBound(viewPos - headerSize(), clampedPos, viewPos)); + } +} + void QQuickListViewPrivate::updateHeader() { Q_Q(QQuickListView); @@ -1419,9 +1454,14 @@ void QQuickListViewPrivate::updateHeader() if (headerPositioning == QQuickListView::OverlayHeader) { listItem->setPosition(isContentFlowReversed() ? -position() - size() : position()); } else if (visibleItems.count()) { + const bool fixingUp = (orient == QQuickListView::Vertical ? vData : hData).fixingUp; if (headerPositioning == QQuickListView::PullBackHeader) { - qreal viewPos = isContentFlowReversed() ? -position() - size() : position(); - qreal clampedPos = qBound(originPosition() - headerSize(), listItem->position(), lastPosition() - headerSize() - size()); + qreal headerPosition = listItem->position(); + const qreal viewPos = isContentFlowReversed() ? -position() - size() : position(); + // Make sure the header is not shown if we absolutely do not have any plans to show it + if (fixingUp && !headerNeedsSeparateFixup) + headerPosition = viewPos - headerSize(); + qreal clampedPos = qBound(originPosition() - headerSize(), headerPosition, lastPosition() - size()); listItem->setPosition(qBound(viewPos - headerSize(), clampedPos, viewPos)); } else { qreal startPos = originPosition(); @@ -1539,13 +1579,46 @@ void QQuickListViewPrivate::fixup(AxisData &data, qreal minExtent, qreal maxExte bias = -bias; tempPosition -= bias; } - FxViewItem *topItem = snapItemAt(tempPosition+highlightRangeStart); + + qreal snapOffset = 0; + qreal overlayHeaderOffset = 0; + bool isHeaderWithinBounds = false; + if (header) { + qreal visiblePartOfHeader = header->position() + header->size() - tempPosition; + isHeaderWithinBounds = visiblePartOfHeader > 0; + switch (headerPositioning) { + case QQuickListView::OverlayHeader: + snapOffset = header->size(); + overlayHeaderOffset = header->size(); + break; + case QQuickListView::InlineHeader: + if (isHeaderWithinBounds && tempPosition < originPosition()) + // For the inline header, we want to snap to the first item + // if we're more than halfway down the inline header. + // So if we look for an item halfway down of the header + snapOffset = header->size() / 2; + break; + case QQuickListView::PullBackHeader: + desiredHeaderVisible = visiblePartOfHeader > header->size()/2; + if (qFuzzyCompare(header->position(), tempPosition)) { + // header was pulled down; make sure it remains visible and snap items to bottom of header + snapOffset = header->size(); + } else if (desiredHeaderVisible) { + // More than 50% of the header is shown. Show it fully. + // Scroll the view so the next item snaps to the header. + snapOffset = header->size(); + overlayHeaderOffset = header->size(); + } + break; + } + } + FxViewItem *topItem = snapItemAt(tempPosition + snapOffset + highlightRangeStart); if (strictHighlightRange && currentItem && (!topItem || (topItem->index != currentIndex && fixupMode == Immediate))) { // StrictlyEnforceRange always keeps an item in range updateHighlight(); topItem = currentItem; } - FxViewItem *bottomItem = snapItemAt(tempPosition+highlightRangeEnd); + FxViewItem *bottomItem = snapItemAt(tempPosition + snapOffset + highlightRangeEnd); if (strictHighlightRange && currentItem && (!bottomItem || (bottomItem->index != currentIndex && fixupMode == Immediate))) { // StrictlyEnforceRange always keeps an item in range updateHighlight(); @@ -1553,27 +1626,92 @@ void QQuickListViewPrivate::fixup(AxisData &data, qreal minExtent, qreal maxExte } qreal pos; bool isInBounds = -position() > maxExtent && -position() <= minExtent; - if (topItem && (isInBounds || strictHighlightRange)) { - if (topItem->index == 0 && header && tempPosition+highlightRangeStart < header->position()+header->size()/2 && !strictHighlightRange) { - pos = isContentFlowReversed() ? - header->position() + highlightRangeStart - size() : header->position() - highlightRangeStart; + + if (header && !topItem && isInBounds) { + // We are trying to pull back further than needed + switch (headerPositioning) { + case QQuickListView::OverlayHeader: + pos = startPosition() - overlayHeaderOffset; + break; + case QQuickListView::InlineHeader: + pos = isContentFlowReversed() ? header->size() - size() : header->position(); + break; + case QQuickListView::PullBackHeader: + pos = isContentFlowReversed() ? -size() : startPosition(); + break; + } + } else if (topItem && (isInBounds || strictHighlightRange)) { + if (topItem->index == 0 && header && !hasStickyHeader() && tempPosition+highlightRangeStart < header->position()+header->size()/2 && !strictHighlightRange) { + pos = isContentFlowReversed() ? -header->position() + highlightRangeStart - size() : (header->position() - highlightRangeStart + header->size()); } else { - if (isContentFlowReversed()) - pos = qMax(qMin(-static_cast<FxListItemSG*>(topItem)->itemPosition() + highlightRangeStart - size(), -maxExtent), -minExtent); - else - pos = qMax(qMin(static_cast<FxListItemSG*>(topItem)->itemPosition() - highlightRangeStart, -maxExtent), -minExtent); + if (header && headerPositioning == QQuickListView::PullBackHeader) { + // We pulled down the header. If it isn't pulled all way down, we need to snap + // the header. + if (qFuzzyCompare(tempPosition, header->position())) { + // It is pulled all way down. Scroll-snap the content, but not the header. + if (isContentFlowReversed()) + pos = -static_cast<FxListItemSG*>(topItem)->itemPosition() + highlightRangeStart - size() + snapOffset; + else + pos = static_cast<FxListItemSG*>(topItem)->itemPosition() - highlightRangeStart - snapOffset; + } else { + // Header is not pulled all way down, make it completely visible or hide it. + // Depends on how much of the header is visible. + if (desiredHeaderVisible) { + // More than half of the header is visible - show it. + // Scroll so that the topItem is aligned to a fully visible header + if (isContentFlowReversed()) + pos = -static_cast<FxListItemSG*>(topItem)->itemPosition() + highlightRangeStart - size() + headerSize(); + else + pos = static_cast<FxListItemSG*>(topItem)->itemPosition() - highlightRangeStart - headerSize(); + } else { + // Less than half is visible - hide the header. Scroll so + // that the topItem is aligned to the top of the view + if (isContentFlowReversed()) + pos = -static_cast<FxListItemSG*>(topItem)->itemPosition() + highlightRangeStart - size(); + else + pos = static_cast<FxListItemSG*>(topItem)->itemPosition() - highlightRangeStart; + } + } + + headerNeedsSeparateFixup = isHeaderWithinBounds || desiredHeaderVisible; + if (headerNeedsSeparateFixup) { + // We need to animate the header independently if it starts visible or should end as visible, + // since the header should not necessarily follow the content. + // Store the desired viewport position. + // Also store the header position so we know where to animate the header from (fixupHeaderPosition). + // We deduce the desired header position from the desiredViewportPosition variable. + pos = qBound(-minExtent, pos, -maxExtent); + desiredViewportPosition = isContentFlowReversed() ? -pos - size() : pos; + + FxListItemSG *headerItem = static_cast<FxListItemSG*>(header); + fixupHeaderPosition = headerItem->position(); + + // follow the same fixup timeline + QObjectPrivate::connect(&timeline, &QQuickTimeLine::updated, this, &QQuickListViewPrivate::fixupHeader); + QObjectPrivate::connect(&timeline, &QQuickTimeLine::completed, this, &QQuickListViewPrivate::fixupHeaderCompleted); + } + } else if (isContentFlowReversed()) { + pos = -static_cast<FxListItemSG*>(topItem)->itemPosition() + highlightRangeStart - size() + overlayHeaderOffset; + } else { + pos = static_cast<FxListItemSG*>(topItem)->itemPosition() - highlightRangeStart - overlayHeaderOffset; + } } } else if (bottomItem && isInBounds) { if (isContentFlowReversed()) - pos = qMax(qMin(-static_cast<FxListItemSG*>(bottomItem)->itemPosition() + highlightRangeEnd - size(), -maxExtent), -minExtent); + pos = -static_cast<FxListItemSG*>(bottomItem)->itemPosition() + highlightRangeEnd - size() + overlayHeaderOffset; else - pos = qMax(qMin(static_cast<FxListItemSG*>(bottomItem)->itemPosition() - highlightRangeEnd, -maxExtent), -minExtent); + pos = static_cast<FxListItemSG*>(bottomItem)->itemPosition() - highlightRangeEnd - overlayHeaderOffset; } else { QQuickItemViewPrivate::fixup(data, minExtent, maxExtent); return; } + pos = qBound(-minExtent, pos, -maxExtent); qreal dist = qAbs(data.move + pos); - if (dist > 0) { + if (dist >= 0) { + // Even if dist == 0 we still start the timeline, because we use the same timeline for + // moving the header. And we might need to move the header while the content does not + // need moving timeline.reset(data.move); if (fixupMode != Immediate) { timeline.move(data.move, -pos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2); |